US2756549A - Abrasive assembly - Google Patents

Description

y 31, 1956 H. s. MACULLAR ABRASIVE ASSEMBLY Filed Sept. 17, 1954 United States Patent ABR'ASIVE ASSEMBLY Harvey S. Macullar, Lynnfield Center, Mass. Application September 17, 1954, Serial No. 456,776

4 Claims. (Cl. 51-'136 My invention relates to an abrasive assembly and has particular reference to the production of an efficient inexpensive abrasive assembly with several layers of abrasive sheets and with a compressible, yielding abrasive surface on the assembly.

The present application discloses an improvement on my invention disclosed in my application filed July 29, 1954, Serial Number 446,620, in which is explained an abrasive sheet with compressible, yielding corrugations or arches.

In the preferred embodiment of my invention the abrasive assembly is composed of a backing element, a flexible, yielding, compressible backing sheet and several layers of abrasive sheets.

One object of my invention is to have a flexible, yielding surface on the abrasive assembly so that a rough raised abrasive particle or particles on the abrasive surface will not dig into and mar the article being sanded to as great a degree as if the abrasive sheet had a rigid abrasive surface.

Another and most important object of my invention is to have the abrasive surface of the assembly flexible and compressible so that the abrasive surface will have a resilient tendency to spring-back when pressure is applied to the assembly. The presence of the resilient abrasive surface maintains a more nearly constant pressure of the abrasive particles against the surface to be sanded and a more maximum abrasive efiiect is obtained.

Still another object of my invention is to provide a larger abrasive surface having pressure behind it then is usually obtained when a sheet of abrasive material is used. The usual abrasive sheet is held under the palm of the hand and pressure exerted on the abrasive sheet only where three or four finger tips press upon the sheet, in my invention the resilient spring-like effect of my assembly causes a larger more effective abrasive surface under pressure to be put to use.

Another object of my invention is to have an abrasive assembly that has a flexible, yielding, convex surface on the abrasive sheet being worked so that as pressure is applied to the assembly more abrasive surface will come into contact with the material being sanded.

Another object of my invention is to provide an assembly with several sheets of abrasive material. As a sheet becomes Worn or dirty it can be torn-off the assembly and a fresh sheet used. Also, having the several sheets of abrasive material fastened in a compact assembly eliminates waste as often loose sheets become dirty, crumpled or torn and then discarded.

The rounded abrasive side edges of my assembly also permits the assembly to be used in mouldings and crevices where the abrasive surface of the ordinary sandpaper block would not reach. There is also the further convenience of having the abrasive material on a backing at all times which does away with the necessity of looking around for a block and attaching an abrasive sheet to the block.

With such objects in view and others that will be ap- ICC parent from the following disclosure, my invention consists in the abrasive assembly as hereinafter described and claimed. 1

Figure 1 is a perspective view of the abrasive assembly.

Figure 2 is an end view of the abrasive assembly.

Figure 3 is a partial section showing the structure of the abrasive assembly.

Figure 4 is an end view of the assembly when slight pressure is applied.

Figure 5 is a side view of the assembly when slight pressure is applied.

Referring to the figures there is shown a rectangular backing element 1 composed of double faced corrugated cardboard or other suitable material of the desired thickness and strength with a hole 9 through and near one end of the said backing element. The hole 9 may be of any desired size or shape to provide means for hanging-up the assembly when it is not in use. A flexible, yielding, supporting sheet 6, composed of cardboard or other suitable material is superimposed upon the backing element 1. The said supporting sheet 6, when placed on the backing element 1, forms a low, wide, flexible, yielding arch, the said arch having inward slanting walls and outward extending horizontal flaps at the bottom of the arch. Sheets of abrasive material 2, 3, 4 and 5 are superimposed with the abrasive surface outward, in layers, upon the said supporting sheet 6. The supporting sheet 6 and the sheets of abrasive material are attached by staples, adhesive or other means to the backing element 1 to complete the abrasive assembly.

From the foregoing description, taken in connection with the accompanying drawing, I have shown a simple and practical embodiment of my invention as reduced to practice. It is to be understood that the particular construction illustrated is susceptible of modification in various ways. The abrasive surface on the abrasive sheets need not cover the entire surface of the sheet but may extend only across the face of the assembly and there may be perforations or creases in the abrasive sheets to assist in tearing-off a sheet. The abrasive assembly may also be made in the form of a continuous belt or in the form of a disk without departing from the spirit of my invention.

Having described my invention what I claim is:

1. An abrasive assembly comprising a flat, rectangular, cardboard backing element; a cardboard backing sheet in the form of a low, wide, flexible, yielding arch, superimposed upon and extending across the width and over the length of the said backing element, the said backing sheet having a convex top, yielding, inward, slanting side walls and flaps extending horizontally on each side at the foot of the arch, said backing sheet attached to the backing element; an abrasive sheet with the abrasive surface of the sheet facing outward, in the form of a low, wide, flexible, yielding arch, superimposed upon and extending across the width and over the length of the said backing sheet, the said abrasive sheet having a convex top, inward, slanting side walls and flaps extending horizontally on each side at the foot of the arches, said abrasive sheet attached to the backing sheet.

2. An abrasive assembly comprising a cardboard backing element; a low, wide, flexible, yielding, supporting arch of the desired material attached and extending across the width and over the length of the said backing element; the said arch having a convex top, inward slanting side walls and flaps extending horizontally on each side at the foot of the arch; an abrasive sheet, with the abrasive surface facing away from the said backing element, superimposed upon and attached to the said supporting arch.

3. An abrasive assembly comprising a flat backing element; a low, wide, supporting arch, said arch having yielding, inward slanting, compressible side walls and horizontal extending flaps at the foot of the said arch, the said arch attached to one side of the backing element; :an abrasive sheet'in'the formof a low, wide arch,

*said abrasive sheet arch having yielding compressible side walls and horizontal extending flaps at the foot of the said .arch, the said abrasive sheetsuperimposed upon and attached to the said supporting arch.

4. An abrasive assembly comprising a backing element; an abrasive sheet, each sheet formed in the shape of a Wide arch with flexible, compressible yielding, inward slanting, side walls and horizontal extending flaps at the foot of each side of the arch; a supporting element in the shape of a wide arch with flexible, compressible yielding inward-slanting, side Walls and horizontal extending'fiaps at .the footof each side of the arch; the said abrasive sheet superimposed upon and attached to the said supporting element; the said supporting element superimposed upon and attached to the said backing element.

References Cited in the file of this patent UNITED STATES PATENTS 466,337 Fries Jan. 5, 1892 1,401,719 Myers Dec. 27, 1921 2,010,332 Steeg et a1 Aug. 6, 1935 2,231,453 Pitar et a1 Feb. 11, 1941 2,495,370 Field Jan. 24, 1950 2,546,245 Weigel Mar. 27, 1951 FOREIGN PATENTS 62,793 Norway Aug. 5, 1940 385,649 France Mar. 25, 1908 510,553 Great Britain Aug. 3, 1939

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